Shrinkage and Crack Monitoring Method of Concrete Based on OFDR
DUAN Wencong
LI Yingming
TAO Qiangsheng
Abstract：A method for accurately measuring concrete shrinkage and crack development is proposed based on optical frequency domain reflectometry(OFDR)technology using a distributed optical fiber strain analyzer.Laboratory experiments were conducted to investigate the effects of single and hybrid additions of 0.2%polypropylene fiber(PPF)or 1%steel fiber(SF)by volume on shrinkage behavior and crack morphology of self-compacting concrete(SCC),with 30%cement replaced by fly ash(FA).The results show that this method effectively identifies,locates,tracks,and quantifies crack evolution by analyzing strain fields induced by shrinkage and crack formation/propagation.Compared to the control mix with 30%FA,the addition of 1%SF alone reduces the drying shrinkage strain of SCC from 725 μm/m to 314 μm/m,while the hybrid addition of 1%SF and 0.2%PPF decreases the crack width from 2.10 mm to 0.07 mm.
Keywords：self-compacting concreteoptical frequency domain reflection technologysteel fiberpolypropylene fiberdrying shrinkage
Publication Date：2025-09-30
Online Publishing Date：2025-10-17(First online date of this platform, not the publication date of the document)
Pages：10( 937-946 )